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win32: convert clipboard to and from CR+LF

--- a/gui-win32/screen.c

+++ b/gui-win32/screen.c

@@ -594,7 +594,7 @@

 clipread(void)

 {

 	HANDLE h;

-	char *p;

+	char *p, *q, *r;

 	if(!OpenClipboard(window)){

 		oserror();

@@ -609,11 +609,42 @@

 		oserror();

 		return strdup("");

 	}

+

+	for(q = r = p; *q != 0; q++)

+		if(*q != '\r')

+			*r++ = *q;

+	*r = 0;

 	CloseClipboard();

 	return p;

 }

+static char *

+addcr(char *buf, int *lp)

+{

+	int nlen;

+	char *r, *p, *q;

+

+	nlen = 0;

+	for(p = buf; *p != 0; p++){

+		if(*p == '\n')

+			nlen++;

+		nlen++;

+	}

+	*lp = nlen;

+	r = malloc(nlen + 1);

+	if(r == nil)

+		panic("malloc: %r");

+	q = r;

+	for(p = buf; *p != 0; p++){

+		if(*p == '\n')

+			*q++ = '\r';

+		*q++ = *p;

+	}

+	*q = 0;

+	return r;

+}

+

 int

 clipwrite(char *buf)

 {

@@ -620,7 +651,8 @@

 	HANDLE h;

 	char *p;

 	Rune16 *rp;

-	int n = strlen(buf);

+	char *crbuf;

+	int n;

 	if(!OpenClipboard(window)) {

 		oserror();

@@ -633,11 +665,13 @@

 		return -1;

 	}

+	crbuf = addcr(buf, &n);

+

 	h = GlobalAlloc(GMEM_MOVEABLE|GMEM_DDESHARE, (n+1)*sizeof(Rune));

 	if(h == NULL)

 		panic("out of memory");

 	rp = GlobalLock(h);

-	utftorunes16(rp, buf, n+1);

+	utftorunes16(rp, crbuf, n+1);

 	GlobalUnlock(h);

 	SetClipboardData(CF_UNICODETEXT, h);

@@ -646,7 +680,7 @@

 	if(h == NULL)

 		panic("out of memory");

 	p = GlobalLock(h);

-	memcpy(p, buf, n);

+	memcpy(p, crbuf, n);

 	p[n] = 0;

 	GlobalUnlock(h);

@@ -653,6 +687,7 @@

 	SetClipboardData(CF_TEXT, h);

 	CloseClipboard();

+	free(crbuf);

 	return n;

 }